lifted heavy bag up/down stairs- worried!

Diana
hey guys- a bit nervous so I thought I'd post bc it helps to talk it out :) I live in nyc and I am a makeup artist. I'm 6 weeks 1 day and today I had a job- I lifted my heavy kit up and down the subway stairs and up a flight of stairs to the studio... and I'm worried now that that was really bad to do bc I just saw an article about avoiding any sort of heavy lifting... my lower back is really bothering me now, and of course, I'm starting to be paranoid and freak out that i was an idiot and could potentially cause myself to miscarry early now ... should have taken a cab! anyone else lift anything heavy? or has doctor told anyone not to do that? just worried...